Fix permission check for get/setSmscAddress.

Based on api-council feedback. Incorporated other suggestions too.

Test: basic SMS sanity
Bug: 149236716
Change-Id: I60b300d1b2d4e8b67cfc121e10a7957a8f0aaac8

telephony/common/com/android/internal/telephony/SmsApplication.java

@@ -1057,7 +1057,8 @@ public final class SmsApplication {
     }
 
     /**
-     * Check if a package is default sms app (or equivalent, like bluetooth)
+     * Check if a package is default sms app (or equivalent, like bluetooth), and verify that
+     * packageName belongs to the caller.
      *
      * @param context context from the calling app
      * @param packageName the name of the package to be checked
@@ -1066,8 +1067,22 @@ public final class SmsApplication {
     @UnsupportedAppUsage
     public static boolean isDefaultSmsApplication(Context context, String packageName) {
         if (packageName == null) {
+            Log.e(LOG_TAG, "isDefaultSmsApplication: packageName is null");
             return false;
         }
+        try {
+            if (Binder.getCallingUid()
+                    == context.getPackageManager().getPackageUid(packageName, 0)) {
+                Log.e(LOG_TAG, "isDefaultSmsApplication: " + packageName + " calling uid "
+                        + context.getPackageManager().getPackageUid(packageName, 0)
+                        + " does not match calling uid " + Binder.getCallingUid());
+                return false;
+            }
+        } catch (NameNotFoundException ex) {
+            Log.e(LOG_TAG, "isDefaultSmsApplication: packageName " + packageName + " not found");
+            return false;
+        }
+
         final String defaultSmsPackage = getDefaultSmsApplicationPackageName(context);
         if ((defaultSmsPackage != null && defaultSmsPackage.equals(packageName))
                 || BLUETOOTH_PACKAGE_NAME.equals(packageName)) {

telephony/java/android/telephony/SmsManager.java

@@ -2898,7 +2898,7 @@ public final class SmsManager {
                         getSubscriptionId(), null);
             }
         } catch (RemoteException ex) {
-            // ignore it
+            throw new RuntimeException(ex);
         }
         return smsc;
     }
@@ -2920,7 +2920,8 @@ public final class SmsManager {
      * </p>
      *
      * @param smsc the SMSC address string.
-     * @return true for success, false otherwise.
+     * @return true for success, false otherwise. Failure can be due to caller not having the
+     * appropriate permission, or modem returning an error.
      */
     @SuppressAutoDoc // for carrier privileges and default SMS application.
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
@@ -2932,7 +2933,7 @@ public final class SmsManager {
                         smsc, getSubscriptionId(), null);
             }
         } catch (RemoteException ex) {
-            // ignore it
+            throw new RuntimeException(ex);
         }
         return false;
     }